Casio is one of the three great watchmakers in Japan, leading the industry with innovative technology. Casio specializes in making electronic calculators, and in 1983 released the world's first shock-resistant watch, the G-SHOCK. Casio entered the Chinese market earlier and is popular because of its fashionable appearance and high cost performance. Radio and solar technology is a hallmark of Casio. The Casio Mountaineering Watch is arguably the most complete product available, and the Protrek series is designed to handle most outdoor scenarios with features such as mud resistance, magnetic resistance, electronic compass, world time, temperature measurement, and more. Casio's unique solar battery claims that there is no need to worry about battery life for 10 years, which is also one of the advantages of PRO TREK Outdoor Action.